Antosz has been a volunteer in his community most of his life, from the age of 13 when he volunteered at Anna Jacques Hospital, served 5 years as a active volunteer with Emergency Management to the rank of Lieutenant. In 1998 moved to New Hampshire with his wife and 2 children, IN 2003 joined as a volunteer firefighter with the Epping Fire Department serving 6 years. Joined the Knights of Columbus in 2003 Council #6850, and is a Fourth Degree Member. On November 4, 2010 Antosz was elected to serve a term in the New Hampshire House of Representatives on the Criminal Justice & Public Safety Committee. In 2012, Jason was elected by his peers to the Rockingham County Republican Executive Council, to serve as Finance Chairman, and also serves as a voting member of the NH State Republican Delegation. In April 2013, Antosz was a key player and a founder in forming the Epping Republican Town Committee, and was later elected to serve as the Chairman for the Greater Epping Republican Town Committee. Antosz lost in the 2012 and 2014 relection for State Rep. in District 9 consisting of Epping.